J/{psi} and {psi}(2S) production in p{ovr p} {radical}{ovr s} = 1.8 TeV.

Abstract

We present a study of J/{psi} and {psi}(2S) production in p{ovr p} collisions, at sqrt[s] = 1.8 TeV with the CDF detector at Fermilab. The J/{psi} and {psi}(2S) mesons are reconstructed using their {mu}{sup +}{mu}{sup -} decay modes. We have measured the inclusive production cross section for both mesons as a function of their transverse momentum in the central region, |{eta}| < 0.6. We also measure the fraction of these events originating from b hadrons. We thus extract individual cross sections for J/{psi} and {psi}(2S) mesons from b-quark decays and prompt production. We find a large excess (approximately a factor of 50) of direct {psi}(2S) production compared with predictions from the color singlet model.

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